AnimeTime™ Oda Nobuna no Yabou
A modern-day school boy named Yoshiharu Sagara who is transported to Japan's Sengoku Jidai (Era of the Warring States) - except the well known warriors of the era are female. Oda Nobuna, a cute girl who happens to be a warlord, nicknames Yoshiharu "Monkey" and takes him under her wing.
Yeah even Kirino hates Kpop fandom...